Improvement in molding pipes



JOHN AsTON,

OF PITTSBURG, ASSIGNOB TO WILLIAM SMITH, 0F

ALLEGHENY CITY, PENNSYLVANIA.

IMPROVEMENT vIN MOLDING PIPES.

Specification forming part of Letters Patent No. 82,065, dated September 15, 1868.

To all whom it may concern:

lBe it known that I, JOHN ASTON, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Pits for Making and Drying Molds for Gast-Iron Pipes; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specication.

The nature of my invention consists in making a deep pit with square ends and ovalshaped sides; by also providing a suitable furnace at each end of the pit and near the ground-Hoor, which furnaces have iiues which traverse along the sides of the before-mentioned pit; by also providing a series of circular orifices or outlets on the top of the before-mentioned lues 5 by also providing a series of frame-work, which I call ramming-up stools, which are above and rest on the top of the before-mentioned iues, so arranged that one of the outlets before mentioned will be in the center between each arm of the aforesaid frame; by also providing a stopper to close up the outlets before named; by also providing an annular nozzle of a tapered form, on which is placed a sliding thimble; by also providing an ordinary pipeilask with a hinged lid or door at its base; by also providing a cast-iron bar of an L section, which is placed along each side wall of the before-mentioned pit, which bar is pierced with a series of small holes; by also providing a side plate, cut out with a series of semicircular orifices, which fit the circle or diameter of the aforesaid ilask, and act as a rest for them when in position.

In the accompanying drawings, Figure 1 is a plan of my improved pit 5 Fig. 2, a longitudinal section, showing flask, nozzle, and stopper 5 Fig. 3, two half cross-sections, the righthand one illustrating the passage of the fire or hot air through the ilue, up the nozzle and sliding thimble, and through the flask, the left-hand one illustrating the construction of the nre-grate, bridge-wall, and iiue of the furnace; Fig. 4, an elevation of pipe-flask, showing hinged door or lid fastened; Fig. 5, an

elevation of pipe-flask, showing hinged door opened; Fig. 6, a plan of hinged door.

A represents the pit; B, the furnaces; C, the fines; CC, the outlets in the ilues; D, the ramming-up stools; E, the stopper 5 F, the nozzle; FF, the sliding thimble; G, the pipeilask; G", the hinged door or lid; K, the castiron bars; L, the'side plates. s

The mode of operating my improved pit is as follows, viz., by closing the hinged door GG of the pipe-liask G and placing the iiask G, by means of cranes or suitable machinery, on the ramming-up stool D; then the molding is done in the ordinary manner; then, by slacking the hinged door G", so that it falls open, and then placing the nozzle F underneath the iiask and over one of the outlets 0, and pushing upward the sliding thimble, so that it will pass up an inch or two into the mold in the ask G5 then, by lighting a re in the furnaces B, the heated air, gases, and smoke pass along the flues C through the outlet C, nozzle F, sliding thimble FF, and through the iiask G, and thus dry the mold.

The-use of the stopper E is to close up the outlets CC of the flues C and prevent the escape of the heat from the furnaces B when not wishing to dry the molds.

The advantage arising from the use of my improvements in pits is that heretofore the molding has been done in a dierent compartment than the drying, thus causing the flasks and molds to be moved from the molding-pit to the drying-kiln, and injuring the molds by shaking during their traverse.

Since the whole Operation of molding, drying, and casting can be done in my pit without moving the iiask,it insures better castings, and saves time, extra labor, and, necessarily, expense.

Having thus described the nature, construction, and operation of my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combined arrangement of the flask G and hinged door G, substantially as described.

2. The pit A, furnaces B, with their ues O and outlets C, ramming-up stools D, Stoppers f E, nozzle F, and sliding thimble FF,n the bars In testimony that I claim the foregoing as K, and side plates L, when combined and ar. my own I afx my signature in presence of ranged substantially as herein described, and two Witnesses.

for the purpose set forth.

3. Drying pipe-molds by means of passing JOHN' ASTON currents of heated air or gases through them `Without removing them from the pit in which Witnesses: the operations of molding and casting are PERGEVAL BEGKETT, carried on, substantially as described. W. H. SMIT. 

